…There are two types of quenching: the phenomenon in which the intensity of luminescence such as fluorescence or phosphorescence is reduced by some kind of action, and the phenomenon in which the field of view becomes dark in a certain direction when a birefringent crystal plate is rotated between two polarizers with mutually perpendicular polarization directions. The former is called quenching, and the latter is called extinction. Quenching occurs in the following ways: (1) the excitation energy of the luminescent molecule is lost by collision with a quenching substance, (2) a chemical reaction occurs by collision with a quenching substance, or an intermolecular compound that does not emit light is formed, or (3) the luminescent molecule changes to a molecular state that does not emit light by nonradiative transition or decomposition reaction. … *Some of the terminology explanations that mention "Extinction" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…消光には,蛍光やリン(燐)光などのルミネセンスの強度がなんらかの作用によって減少する現象と,複屈折性の結晶板を偏光方向が互いに直交している2枚の偏光子の間に置いて見るとき,結晶板を回転していくとある特定の方位で視野が暗黒になる現象との二つがあり,前者をクエンチングquenching,後者をエクスチンクションextinctionという。 クエンチングは,(1)発光分子の有している励起エネルギーを消光物質との衝突によって失うか,(2)消光物質との衝突によって化学反応を起こしたり,発光を起こさない分子間化合物をつくるか,(3)発光分子が,非放射遷移や分解反応などによって発光を起こさない分子状態に変わる,などの方法で起こる。… ※「エクスチンクション」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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